| Products > Test Equipment |
| JDSU JD745B analyser battery replacement / LI204SX battery substitution |
| (1/1) |
| Technical Mayhem:
Picked up a JDSU JD-745B analyser that came without a battery. It seems to use a somewhat standard battery, the 3S 11.1V 7800mAh LI204SX. I thought about picking up a secondhand battery and repacking it but they're too expensive... Next thought was getting a much less expensive drone battery and sticking it inside the case / hacking the wiring in permanently. Does anyone have info on the LI204SX battery pinout? Looks to be 5 connections so initial naive guess is that 4 are for cell power & balancing while the 5th could be temp. Cheers |
| Hydron:
I'm also in the camp of "oh I'll just eBay a battery" then saw the price and reconsidered. My unit actually came with a battery but it died a while ago (probably over discharge, possibly a bad cell), so I took it apart to try and revive it (a difficult job). Even with some charged cells connected it refuses to enable the output, so there might be some flag set when it initially died. Thankfully it's all off the shelf BMS parts inside with datasheets available so I'll try and reset it via I2C when I get chance. Most of my stuff is currently in storage though so that'll be a while in the future - if I do dig up some photographs of the PCB (I probably took some) I'll post them though. |
| Technical Mayhem:
Some pics of the battery insides / BMS would be very helpful! I'll have a look at the JD745 side to see what comms it's looking for. Might just end up making up a pack of 6 18650's with a 3S BMS board and an external charger and see if I can get the JD745 ignore any comms signals. Cheers |
| Technical Mayhem:
Hooked up a 12V PSU to the battery connector and the unit was happy enough to boot up. Not sure if it will charge without comms, but there was ~12.7V being provided by the JD745B PSU module with the battery removed... I'm going to make up a pack of 6 18650's and a BMS PCB from eBay. Plenty of room in there. Cheers |
| Technical Mayhem:
Just some info for others that come across this: The unit will charge the batteries at 1.5A and drop off to 0A as they approach about 12.6V. Unit will disconnect about 9.6V. |
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